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Summary of Significant Accounting Policies - Shares Used in Computing Basic and Diluted Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Denominator (thousands of shares):        
Weighted-average common shares outstanding - basic (in shares) 209,826 209,857 209,789 209,902
Incremental shares issuable for stock options, common stock awards and Equity Units (in shares) 5,419 6,263 5,604 0
Weighted-average common shares outstanding - diluted (in shares) 215,245 216,120 215,393 209,902
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 8,659 5,980 8,468 6,348